.left {
    width: 250px;
    .top {
        width: 100%;
        height: 600px;

        ul {
            span {
                width: 10px;
                height: 20px;
                line-height: 20px;
                margin-top: 15px;
                // border: 1px solid red;
                border-radius: 20px;
                // padding-bottom: 5px;
                float: right;
                margin-right: 20px;

            }

            span:hover {
                background-color: #c0baba;
            }

            b {
                border-radius: 20px;
                background-color: #c0baba;
            }

            li {
                width: 100%;
                height: 50px;
                line-height: 50px;
                text-align: center;
                border-radius: 20px;

                .nav-link {
                    text-decoration: none;
                    color: #000;
                }

                /* 去除链接的下划线 */

            }

            li:hover {
                background-color: #e4e1e1;
            }
        }
    }

    .xl {
        width: 200px;
        height: 300px;
        position: relative;
        left: 150px;
        top: 0;
        padding-bottom: 40px;
        background-color: #fff;

    }
}